John Mahany Plumbing Provides Water Heaters, Garbage Disposals, Drain Cleaning, and Pressure Regulators to the Yucca Valley, CA Area. If you're unable to get a regular supply of hot water, there could be problems with your water heater that need to be checked. Trust the plumbers at John Mahany Plumbing to identify the problems and provide quality repairs. You can count on us to sell and install water heaters as well.